DE2707893A1 - CLAMPING DEVICE FOR WORKPIECES - Google Patents

Description

^ DR. J.-D. FRHR. by UEXKÜLL

DR. ULRICH GRAF STOLBERG DIPL.-ING. JÜRGEN SUCHANTKE

The Black and Decker (priority: March 9, 1976

Manufacturing Company _{us 66f} . _2Q1 _

701 East Joppa Road

Towson, Md./V.St.A. Hamburg, February 21, 1977

Clamping device for workpieces

The invention relates to a clamping device for workpieces with a substantially rigid base frame with a pair of elongated frame parts lying at a distance from one another, with a pair of elongated frame parts mounted on the frame. Upper parts running across these and lying next to each other with work surfaces lying in a common plane as well as with opposing clamping surfaces, one of which runs in the longitudinal direction of the clamping device Form clamping gap, with first and second clamping devices attached between the base frame and one of the upper parts for guiding an upper part over the frame parts towards or away from the other upper part for a fixed intermediate clamping of a workpiece, with both the first and the second clamping device in such a way on the base frame and are attached to the associated upper part, that the upper parts are independent of each other in the sense of a also at a longitudinal end the clamping device can be adjusted to a wider clamping gap than at the other longitudinal end.

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Such a workbench with two upper parts is already known (US Pat. No. 3,615,087), in which one upper part is attached to one Holding frame is attached, while the other upper part with the help of screw-like clamping devices on the holding frame is movable towards and away from the first upper part. These clamping devices are independent of one another can be actuated so that the displaceable upper part for clamping workpieces with non-parallel side surfaces with respect to of the fixed upper part is adjustable at an angle. The known workbench also has a permanently attached and a collapsible base frame for transport and storage.

In contrast, it is the object of the invention to provide a simpler, light and compact clamping device that only has a small number of parts and is easy to use.

A clamping device of the type mentioned at the beginning, which is characterized in that it solves this problem, that the frame parts locking devices for inserting the have second upper part at different predetermined locations, so that the second upper part for rapid coarse adjustment of the clamping gap can be moved by hand for different workpiece widths, while the upper parts for the fixed

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clamp in the clamping gap for its fine adjustment are also adjustable by hand, and that fastening devices are provided for securing the second upper part in each of the locking devices.

The clamping device according to the invention is on a carrier, Can be mounted on a table or bench. It has a substantially rigid base frame with two spaced apart lying elongated frame parts. Two elongated tops are on top of the spaced frame pieces assembled. These upper parts lie next to one another in the same plane and each have side surfaces running in the longitudinal direction for intermediate clamping of workpieces. Each upper part is with its one end area in one of the two frame parts and held with its other end region in the other of the frame parts. Both tops are about the parallel Frame parts can be moved towards and away from one another. Extendable and retractable clamping devices are between a first Upper part and the base frame attached to the first upper part continuously over the entire length of the parallel frame parts to move back and forth. For the second upper part are at predetermined points at a distance from one another in the parallel Latching devices attached to frame parts are provided for manual adjustment. This makes the second top part quick displaceable relative to the first upper part in such a way that

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a rough adjustment of the clamping gap for a workpiece to be clamped takes place. Clamping takes place after moving of the second upper part by moving the first upper part against the workpiece.

For adjusting and fixing the second upper part by hand in any of several predetermined positions the clamping device according to the invention two spaced apart holding devices, each in a End area of the second upper part are attached and each cooperate with one of the two parallel frame parts. the Parallel frame parts lying at a distance have a number of position markings, for example openings, recesses or protrusions. Each of the holding devices has a foot for engaging with a specific position marker for Fixing the second upper part at any predetermined location. The holding devices are preferably constructed in this way and arranged that the upper part or the clamping board when releasing the clamping device with its holding devices can be pivoted upwards from the parallel frame parts, so that the feet are released from the position markings and that The tensioning board can be moved into the desired position on the frame parts. At this point the tensioning board will be and its holding devices tilted in the opposite direction so that the feet of the holding devices

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reach into the position markings. The holding devices are built so that an involuntary displacement of the associated Clamping board avoided and a clamped workpiece can only be unclamped in the usual way.

The clamping device according to the invention preferably has two independently operable tensioning devices, each at one end of the first upper part or tensioning board are mounted in such a way that the actuation of one of the tensioning devices rotates relative to the other of the first tensioning board about an axis perpendicular to the common plane of the tensioning boards. This is special advantageous for clamping workpieces with non-parallel side surfaces.

The independently operable tensioning device preferably has two elongated screw spindles which are rotatably supported and are fixed with respect to the base frame in the axial direction. At opposite ends of the first top a threaded nut is anchored in each case to hold the screw spindles. The threaded nuts are like this connected to the first upper part that allows rotation about an axis perpendicular to the plane of the tensioning boards is. Accordingly, it becomes one of the screw spindles opposite

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the other rotated, then this causes a rotation of the first upper part or clamping board about this axis.

Further advantageous refinements of the invention result
from the subclaims.

The invention is explained in more detail below with reference to the figures; show it:

Fig. 1 is a perspective view of the invention
Jig on a stand;

Figure 2 is a perspective view of the lifted from the stand Jig;

3 shows a plan view of the clamping device according to the invention;

FIG. 4 shows a view of the clamping device according to FIG. 3;

Fig. 5 is a partially sectioned side view of the tensioning device according to FIG. 3;

Figures 6 and 7 are sections along lines 6-6 and 7-7 of Figure 3;

Fig. 8 is a partial perspective view of a frame member with an adjustable slide block for supporting one end of the clamping boards;

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9 shows a perspective view similar to FIG. 8 with a holding device for fixing a tensioning board one of a plurality of predetermined locations;

Fig. 1O the placement of the clamping device according to the invention on a stand;

11 shows the rear tensioning board removed from the workbench before it is reinserted in the reverse position;

12 shows the clamping device according to the invention mounted on a table.

1 and 2 show a workbench 20 with a workbench according to the invention Tensioning device 22 and a collapsible stand 24. The tensioning device 22 is secured with the aid of brackets 26 releasably attachable to the stand 24, the brackets 26 resiliently with the upper horizontal parts of the stand 24 on the can be brought into engagement in a manner described below. The clamping device 22 according to the invention can also be used directly be placed on another suitable support surface, for example a table or a conventional workbench.

The clamping device 22 comprises a substantially rigid rectangular base frame 28 made of metal (Fig. 3) with two im

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Frame parts arranged at a distance from one another and parallel to one another 30, which are rigidly connected with the aid of two transverse frame parts 32. All frame parts of the base frame are made of relatively thick sheet steel. To achieve the required rigidity of the base frame 28, they are with one another welded.

The base frame 28 carries two elongated, rectangular upper parts or tensioning boards 34 and 36, which are preferably made of multiple glued wood. The tensioning boards 34 and 36 are in a common plane above the frame parts 30 and their Opposite ends protrude somewhat beyond the frame parts 30. The surfaces of the relatively wide Clamping boards 34 and 36 lie in a common plane and form table-like work surfaces. The opposite Side surfaces of the two clamping boards form clamping surfaces 38, 40 according to FIG. 5, between which a workpiece at a movement of the tensioning board 34 against the tensioning board 36 can be clamped in a manner to be described later. The clamping surfaces 38 and 40 are advantageously cut in a V-shape in order to make round parts, for example tubes or rods, easier to be able to clamp. Some workpieces have such a shape that they cannot be clamped between the clamping surfaces 38, 40 are. The two tensioning boards 34 and 36 therefore preferably have a number of spaced apart

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openings 40 which are at right angles to their associated stand at the top of the work surface. The openings 40 are used for receiving of wedges 42 for clamping workpieces. These wedges are in depending on the shape of the workpiece corresponding openings 40 are used so that the vertical end faces 43 of the wedges the workpiece when moving the Clamping boards 34 grasp against the clamping board 36 and the workpiece firmly on the one formed by the clamping boards 34 and 36 Hold work surface.

The following describes the mounting of the tensioning boards 34 and 36 on the frame 30 and the latching devices for the tensioning board 36 described for the quick clamping of workpieces of different sizes.

6 and 7 show the box shape of the frame parts 30 with spaced apart side walls and one Bottom and a top surface, the two inward-facing, is formed at a distance from one another flanges 44. The inner free edges of the flanges are in the Distance to each other. The first upper part 34, referred to as the front tensioning board, is independent of one another by means of two screw-operable clamping devices 46 connected to the frame members 30, each of the clamping devices seated at one end of the front tensioning board 34. Every

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Clamping device 46 has an elongated screw spindle 48 which is welded into one at the front end of each frame part 30 Plate 50 is rotatably supported. The screw spindles 48 protrude backwards into the associated frame parts 30 as far as the front tensioning board is to be moved. An axial displacement of the screw spindles 48 is by a disk and pin arrangement 52 resting on the rear side of the plate 50 and by one preferably made of plastic injection molded and secured with a pin on the front of the plate 50 hand crank 54 prevented. The screw spindles 48 are each screwed into sliding blocks 56 according to FIGS. 5, 7 and 8, on which the front tensioning board 34 with mounted at its opposite ends. The sliding blocks 56 are made of solid injection-molded plastic, among other things for Reduce friction on the frame part 30 and have vertically spaced and outwardly protruding protrusions 58 and 60. The upper protrusions 58 form on the surfaces of the inwardly facing flanges 44 resting shoulders, while the lower projections 60 reach under the flanges 44 and prevent the sliding blocks 56 from lifting out of the frame part 30. Each sliding block 56 penetrating threaded hole serves to accommodate the elongated screw spindle 48. When turning the screw spindles 48 the associated slide block is moved back or forth in its frame part 3O. In the middle part of each sliding block

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56 is a hole arranged at right angles to the screw spindle 48, through which a strong threaded bolt extends 62 according to FIG. 5 and is screwed into an end region of the front tensioning board 34. Thereby are the opposite ends of the tensioning board are attached to the slide blocks 56 while rotating around the axes formed by the threaded bolts 62 is made possible. When turning the hand crank 54, the front Clamping board 34 is moved in the frame part 30 against the rear clamping board 36 or away from it. When turning just one Hand crank, the front tensioning board 34 is pivoted about the axes defined by the threaded bolts 62, so that the front tensioning board 34 relative to the rear according to the dashed line in Fig. 3 about a vertical axis in Angle is adjustable. This is particularly important for workpieces with non-parallel side surfaces. To this The purpose of the sliding blocks 56 in their respective frame part 30 is to have some play in the lateral direction so that they are at do not jam in the frame part 30 if the clamping board is inclined or pivoted. To avoid unscrewing of the screw spindles 48 from the slide blocks 56, the screw spindles carry stops at their end.

The rear tension board 36 has retention means for rapid insertion in a number of predetermined locations

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in the frame parts 30. These holding devices are attached to opposite ends of the rear tensioning board 36 Feet 66 according to FIGS. 5, 6 and 9. The feet 66 are preferably made of strong sheet steel with an elongated hollow Body 68, the flat top surface of which is fastened to the rear tensioning board 36 with the aid of screws 70. The side walls 7 2 of the body 68 fit with play between the edges of the inwardly directed flanges 44. The lower edges of the Side walls are curved backwards and downwards and form a flat base surface at the rear lower end of the body 68 74, which rests on the bottom surface of the frame part 30. A downwardly pointing foot 76 is formed on the base surface 74, which fits into each of the numerous rectangular openings in the bottom surface of the frame part 30 with one another are provided in alignment. The rear edge of the foot 7 6 has a flat recess 80 according to FIG. 5. The recess 80 is in engagement with the edge of the opening 78 under the action of a compressive force acting on the rear tensioning board 36.

It is clear to the person skilled in the art that other measures than the openings 78 for the cooperation with the foot of the holding device 66 can be provided. For example, the base of the frame part can have projections or spaced apart Have recesses for the engagement of the feet and the absorption of the pressure loads acting on the tensioning board 36.

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For guiding and holding the front area of the holding device 66 are each a pair of upper and lower extensions 82 and 84, which are formed on the front edges of the side walls 72 are. The upper two extensions 82 rest on the upper surfaces of the inwardly directed flanges 44, while the two lower extensions 84 engage under the flanges 44. To move the rear tensioning board 36, this becomes something pushed forward until the recesses 80 come free from the edges of the openings 78. Thereafter, the tensioning board 36 and the holding devices 66 fastened thereon in the direction of arrow A according to FIG. 5 around that of the extensions 82 and 84 The pivot point formed is tilted until the feet 7 6 are completely removed from the openings 78. Then it can Clamping board 36 with its holding devices 66 can be easily moved along the frame parts 30 into the desired position, which depends on the dimensions of the workpiece to be clamped. When this new position is reached, the rear tensioning board becomes 36 for inserting the feet 7 6 into other openings 78 of the frame parts 30 pivoted in the opposite direction. Because the from a clamped workpiece to the rear clamping board 36 forces exerted produce a torque which presses the feet 76 into the openings 78, there is practically no Possibility of involuntary slipping of the rear tensioning board out of the selected tensioning position.

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It should be noted that the rear ends of the frame parts 30 are "open" so that the rear tensioning board 36 can be pushed backwards out of the frame parts and onto the in Fig. 5 can be used "vice versa" shown in dash-dotted lines. This "inverted" position of the rear tensioning board is selected when a workpiece is to be clamped from the inside, i.e. by tensile stress. The ones in the two clamping boards used wedges 42 arranged so that they rest against inner surfaces of the workpiece. The rear For this purpose, the clamping board is brought into the desired position and the front clamping board 34 is moved away from the rear clamping board 36, so that the inner surfaces of the workpiece are pushed apart by the two clamping boards.

The operation of the clamping device according to the invention results from the description above. The latching devices for quickly moving the rear tensioning board 36 into a from many predetermined points offers a significant advantage, since the required clamping times compared to known, only screw spindles having devices are considerably shorter.

This time saving is particularly evident when clamping workpieces with large differences in size. The rear The tensioning board is quickly made according to the dimensions

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of the workpiece to be clamped is placed in the correct position, while the final clamping is carried out by turning the Hand cranks with the help of the front tensioning board 34 takes place.

It should be noted that the attached to opposite ends of the rear chip board 36 holding means 66 are also ar different locations can be used on the frame members 30, i.e. it can be a holding device 66 a little further backwards or forwards used as the opposed other holding device 66, so that there is an inclined position of the rear tensioning board 36 according to the dashed line in FIG. This inclination means pivoting about an axis that is perpendicular to the plane of the tensioning boards 34 and 36, respectively. During this coarse adjustment, the rear tensioning board 36 is rotated with respect to the two holding devices 66 about axes that are spaced apart from one another and are perpendicular to the tensioning board plane and are fixed by the screws 70 fastening the holding devices 66 on the tensioning board 36. The holding devices 66 have so much play in their associated frame parts 30 that a certain inclination of the associated tensioning board is made possible. The inclination of the rear tensioning board 36 is preferably used to support the inclination of the front tensioning board 34 for the tensioning of strongly tapered workpieces.

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In the following, the stand 24 for the invention Clamping device 22 described. Such a stand was suggested in U.S. Patent Application 728,939, dated Oct. 4, 1976. Figs. 1 and 2 show two relatively rigid frames 90 of substantially rectangular shape which are positioned between an operating position according to FIGS. 1 and 2 can be pivoted into a collapsed storage position, the Frame 90 according to the dashed lines in FIG. 2 lie essentially in planes parallel to one another.

Each of the two frames 90 comprises a number of tubular pieces of metal joined together so that each frame two at a distance from each other parallel straight upper and lower pipe parts 92 and 94, respectively, which in the operating state lie in horizontal planes. When the stand 24 is unfolded, they are at right angles to the tube parts 92, 94 standing legs 96 directed upwards at an angle. As already mentioned, the frames 90 are open to one another Position in which the planes spanned by the frame intersect at an acute angle, in the above-mentioned collapsed one Pivotable position.

To secure the two frames 90, one is used at the crossing points the frame 90 provided stand housing 98, which, among other things, the maximum open position of the frame

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90, i.e. the maximum opening angle of the frame 90 spanned planes.

For further details, see the aforementioned US patent application referenced.

Fig. 10 shows the clamping device 22 according to the invention at Place on the stand 24. The clamping device 22 is lowered over the stand 24 until resilient clips 26 with engage the upper horizontal tube portions 92. The elongated lower tube portions 94 of the stand 24 provide good stability of the device even on uneven floor surfaces. You can also use it to further increase stability Put one foot on the lower pipe part 94.

11 shows that removed from the tensioning device 22 rear tensioning board 36 for insertion in the "inverted" position according to the dash-dotted representation in FIG. 5. This a workpiece is to be clamped inside.

Fig. 12 shows the jig 22 held by a common table or workbench in numerous cases the use of a stand 24 is not required, but the clamping device 22 can be on any other on a firm base. Fig. 12 also shows one

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Inclination of the front tensioning board 34 relative to the rear tensioning board 36 for clamping a tapered one Workpiece.

When placing the clamping device on a table or a Bank according to FIG. 12, the resilient brackets 26 are removed from the base frame and replaced by suitable, not shown Replaces buffers that rest on the table or bench surface. If necessary, the clamping device 22 is by means of suitable screwable fastening elements can be attached to the table or bench.

Numerous other embodiments of the invention are conceivable, for example the frame parts are in another embodiment 30 with removable extensions to increase the number of locking positions and thus to expand the span provided the clamping device according to the invention.

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Claims (10)

Expectations Clamping device for workpieces with an essentially rigid base frame with a pair of elongated frame parts lying at a distance from one another, with a pair elongated upper parts mounted on the frame parts, running across them and lying next to each other with working surfaces lying in a common plane as well as with opposing clamping surfaces that form a clamping gap extending in the longitudinal direction of the clamping device, with the first and second between the Base frame and clamping devices attached to each of the upper parts for guiding an upper part over the Frame parts towards or away from the other upper part for a fixed intermediate clamping of a workpiece, wherein both the first and the second clamping device in such a way on the base frame and on the associated Upper part are attached that the upper parts are independent of each other in the sense of a also at a longitudinal end of the Clamping device wider clamping gap than at the other longitudinal end are adjustable, characterized in that the frame parts (30) latching devices (78) for inserting the second upper part (36) at different predetermined ones Have places so that the second upper part (36) for rapid coarse adjustment of the clamping gap for under- 709837/0696 ORIGINAL INSPECTED different workpiece widths can be moved by hand, while the upper parts (34; 36) for clamping in the Clamping gap can also be adjusted manually for its fine adjustment, and that fastening devices for the securing of the second upper part (36) are provided in each of the latching devices (78). 2. Apparatus according to claim 1, characterized in that the securing of the second upper part (36) by means of Fastening devices independent of the direction of movement of the first upper part clamping the workpiece (34) takes place. 3. Apparatus according to claim 1 or 2, characterized in that the locking devices first and second along the Frame parts (30) have holes (78) arranged so that the fastening devices on the second upper part (36) attached extensions (66) are, and that the second upper part (36) about a vertical axis in an inclined position is pivotable with respect to the frame parts (30). 4. Device according to one of claims 1 to 3, characterized in that the fastening devices on the second upper part (36) each have an extension (66) for engagement with one of the holes (78) of the frame parts (30) . 709837/0665 5. Device according to one of claims 1 to 4, characterized in that the extensions (66) each have one Have foot (76) for cooperation with one of the holes (78). 6. Device according to one of claims 1 to 5, characterized in that the frame parts (30) over their length have extending and transversely extending flanges (44), and that the extensions (66) with the flanges (44) interacting guides (82; 84) for guiding the extensions (66) along the frame parts (30) at Possessing the second upper part (36) to a certain point. 7. Device according to one ¹ 1 of claims 1 to 6, characterized in that the clamping devices (46) have two elongated screw spindles (48) which are rotatably supported and fixed in the axial direction with respect to the base frame (28) and each one with an internal thread provided and in the end area of the first upper part (34) mounted sliding block (56), the first upper part (34) around the vertical mounting axis of each Sliding block (56) can be pivoted in its plane in such a way that when one of the screw spindles is rotated (48) the first upper part (34) is pivoted. 709837/0666 8. Device according to one of claims 1 to 7, characterized in that the frame parts (30) are box-shaped are and side walls and each have a bottom, the upper surfaces of the frame parts (30) of each two spaced apart and mutually directed flanges (44) are formed, and that in each case a screw spindle (48) extends into a frame part (30) and in each case carries a sliding block (56), wherein the sliding blocks (56) projections (58, 60) comprising the flanges (44) for guidance in the frame parts (30) exhibit. 9. Device according to one of claims 1 to 8, characterized in that the screw spindles (48) are rotatable are supported at the front end of each frame part (30) and carry hand cranks (54). 10. Device according to one of claims 1 to 9, characterized in that the holes (78) in the bottom of the frame parts (30) are provided, and that the extensions (66) in the unloaded state for releasing their feet (76) the holes (78) and can be tilted up to move to another location. su: ah: kö 709837/0665